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Distinguishability and “which pathway” information in multidimensional interferometric spectroscopy with a single entangled photon-pair
Science Advances ( IF 13.6 ) Pub Date : 2021-09-01 , DOI: 10.1126/sciadv.abj4566
Shahaf Asban 1 , Shaul Mukamel 1
Affiliation  

Correlated photons inspire abundance of metrology-related platforms, which benefit from quantum (anti-) correlations and outperform their classical counterparts. While these mainly focus on entanglement, the role of photon exchange phase and degree of distinguishability has not been widely used in quantum applications. Using an interferometric setup, we theoretically show that, when a two-photon wave function is coupled to matter, it is encoded with “which pathway?” information even at low-degree of entanglement. An interferometric protocol, which enables phase-sensitive discrimination between microscopic interaction histories (pathways), is developed. We find that quantum light interferometry facilitates utterly different set of time delay variables, which are unbound by uncertainty to the inverse bandwidth of the wave packet. We illustrate our findings on an exciton model system and demonstrate how to probe intraband dephasing in the time domain without temporally resolved detection. The unusual scaling of multiphoton coincidence signals with the applied pump intensity is discussed.

中文翻译:

具有单个纠缠光子对的多维干涉光谱中的可区分性和“哪个途径”信息

相关光子激发了大量与计量相关的平台,这些平台受益于量子(反)相关并优于其经典对应物。虽然这些主要集中在纠缠上,但光子交换相位和可区分程度的作用尚未在量子应用中得到广泛应用。使用干涉装置,我们从理论上证明,当双光子波函数与物质耦合时,它会被编码为“哪条路径?” 即使在低纠缠度下的信息。开发了一种干涉协议,可以在微观相互作用历史(途径)之间进行相位敏感的区分。我们发现量子光干涉法促进了完全不同的时间延迟变量集,这些变量不受波包反向带宽的不确定性的约束。我们在激子模型系统上说明了我们的发现,并演示了如何在没有时间分辨检测的情况下探测时域中的带内相移。讨论了多光子符合信号随泵浦强度的异常缩放。
更新日期:2021-09-23
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